PON system and terminal operation registering method

Abstract

In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L).

1. A passive optical network (PON) system in which communication is performed at a plurality of types of transmission rate in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, wherein
 within a discovery period for allowing an unregistered terminal to be recognized by the station apparatus, the terminal makes a discovery response at a limited predetermined transmission rate among the plurality of types of transmission rate, and 
 the predetermined transmission rate is specified by the station apparatus. 
 
     
     
       2. The PON system according to  claim 1 , wherein said predetermined transmission rate is of one type and an unregistered terminal makes a discovery response using the transmission rate within said discovery period. 
     
     
       3. The PON system according to  claim 1 , wherein said station apparatus sets said discovery period at different times for each of the plurality of types of transmission rate and specifies a transmission rate at which a discovery response should be made, and an unregistered terminal makes a discovery response within a discovery period corresponding to a transmission rate used by the unregistered terminal. 
     
     
       4. The PON system according to  claim 1 , wherein said station apparatus transmits, in downstream communication to said terminals, a signal for starting a discovery process at a plurality of types of wavelength having a one-to-one correspondence with said transmission rates and an unregistered terminal having been able to receive the signal makes a discovery response at a transmission rate used by the unregistered terminal. 
     
     
       5. A terminal registering method for a passive optical network (PON) system in which communication is performed at a plurality of types of transmission rate in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, the method comprising:
 setting a discovery period for causing the station apparatus to recognize an unregistered terminal and notifying said terminal of the discovery period; 
 said terminal, making a discovery response at a limited predetermined transmission rate among said plurality of types of transmission rate; and 
 registering a terminal having made a discovery response within said discovery period, in said PON system.